mineral
Polished green-inclusion stone, likely chlorite-included quartz
Quartz (SiO₂) with chlorite inclusions; exact identification is uncertain from the photograph
AI-generated identification · may be incorrectHardness about 7 for quartz; dark gray to translucent with vivid green internal patches, vitreous luster, and no obvious cleavage. The rounded, glossy surface indicates tumbling or polishing; specific gravity is approximately 2.65 for quartz.
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Physical properties
Hardness about 7 for quartz; dark gray to translucent with vivid green internal patches, vitreous luster, and no obvious cleavage. The rounded, glossy surface indicates tumbling or polishing; specific gravity is approximately 2.65 for quartz.
Formation & geological history
Quartz crystallized from silica-rich hydrothermal fluids, while chlorite formed during low- to moderate-temperature alteration and became enclosed in the quartz. Such specimens commonly formed in veins associated with metamorphic or igneous rocks, generally at no single determinable age.
Uses & applications
Used primarily as a lapidary stone, cabochon, or collector specimen; not typically used industrially in this polished form. Value depends strongly on transparency, color contrast, pattern, and finish.
Geological facts
Green inclusions may also represent fuchsite, epidote, or actinolite, which can look similar in a photograph. A loupe, hardness test on an inconspicuous edge, and specific-gravity or mineralogical testing would improve identification.
Field identification & locations
Common sources include Brazil, India, Madagascar, and parts of the Alps. Quartz’s glassy luster and hardness, combined with enclosed green fibrous or flaky inclusions, help distinguish it from solid green minerals.
